CN1090758C - Method for precision detecting and controlling gas density and apparatus thereof - Google Patents
Method for precision detecting and controlling gas density and apparatus thereof Download PDFInfo
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- CN1090758C CN1090758C CN97107248A CN97107248A CN1090758C CN 1090758 C CN1090758 C CN 1090758C CN 97107248 A CN97107248 A CN 97107248A CN 97107248 A CN97107248 A CN 97107248A CN 1090758 C CN1090758 C CN 1090758C
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- gas
- gas density
- pressure
- volumetric standard
- tested container
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Abstract
The present invention relates to a method for precisely detecting and controlling gas density and a device thereof. Quantitative gas is filled in a sealed standard container at the standard temperature. Pressure sensors are used for respectively measuring pressure of the standard container and pressure of a measured container, two pressure values are compared, and a gas density value is obtained. The value is used for controlling a valve, and automatic control is realized. In the device, the pressure sensors are respectively arranged at the standard container and the measured container. Output parts of the pressure sensors are connected with two amplifying circuits which are simultaneously connected comparison circuits and are connected with control circuits. The present invention can eliminate the influence of temperature change to measuring results, and realizes the precise measurement and automatic control for gas density.
Description
The present invention relates to the method for the accurate Detection ﹠ Controling of a kind of gas density, and the device that this method adopted.
In technical fields such as space exploration, gas analysis and Chemical Manufacture, often need the density of gas be detected.Prior art generally is to use pressure transducer measurement gas pressure, promptly at the tested container place pressure transducer is set, and the output of sensor connects amplifying circuit, to obtain pressure value.And the pressure of gas and its temperature have functional relation, and Temperature numerical will obtain the gas density value in continuous variation, the essential temperature factor of getting rid of.Be that pressure survey numerical value must just can draw the density value of gas according to after the variation of temperature reduction, this method is difficult to realize automatic control.Particularly at space industry, the spaceborne X ray gas detector of artificial satellite for example, the variation of its gas density will influence the result who measures power spectrum; Its operating ambient temperature is big dynamic change between-30-+50.With this understanding, traditional measuring method can't realize precision measurement and control automatically.
Task of the present invention provides a kind of new method of utilizing pressure transducer measurement gas density, and it should be able to get rid of the influence of temperature variation to measurement result automatically, is implemented in precision measurement of (for example space environment) gas density under the extreme environment and control automatically.The present invention also provides this method employed device simultaneously.
The technical scheme of finishing the foregoing invention task may further comprise the steps:
(1), a volumetric standard is set, under standard temperature to the sealing volumetric standard fill with quantitative gas, volumetric standard and tested container are on the same isotherm;
(2), measure the pressure of volumetric standard with pressure transducer, as the reference point of manoscopy;
(3), measure the pressure of tested container with pressure transducer;
(4), the force value of two containers is compared, obtain the density values of gas.
When environment temperature changes, will cause the variation of volumetric standard cell pressure signal, make datum mark become a temperature variant curve.With this curve is benchmark, and the change curve of check and correction tested container pressure signal has promptly deducted temperature factor, thereby obtained the density value of gas in the tested container.
When needing control automatically, adopt again (5):
(5), be valve between parameter control tested container and the source of the gas with the gas density value, realize control automatically.
The used device of above method is: same as the prior art, the place is provided with pressure transducer at tested container, the output of sensor connects amplifying circuit, feature of the present invention is: be provided with a volumetric standard, at the volumetric standard place same pressure transducer is set, its output connects amplifying circuit, and two amplifying circuits insert a comparator circuit simultaneously, and the output of comparator circuit can directly be converted into the density value of tested gas.When needing control automatically, with the output Access Control circuit of comparer, the output of control circuit connects the driving mechanism of valve between tested container and the source of the gas, can realize automatic control.Here said volumetric standard should be in the equivalent environment with tested container, particularly should be on the same isotherm.The gas of two containers dress is preferably identical, but so long as all be in absolute gaseous state, different gas also can use.The driving mechanism of said here amplifying circuit, comparator circuit, control circuit and valve all can adopt circuit of the prior art and driving mechanism.
Method and apparatus provided by the invention, overcome deficiency with pressure transducer measurement gas density classic method, the influence of temperature variation be can get rid of automatically, precision measurement of (for example space environment) gas density under extreme environment and control automatically realized measurement result.The present invention also has application prospect in chromatogram, mass spectrometric measurement field except that using in space technology.
Now be described further with embodiment in conjunction with the accompanying drawings.
Fig. 1 is embodiment 1 a principle of work block scheme;
Fig. 2 is same embodiment device structural representation.
Embodiment 1, the gas density control of spaceborne soft x-ray detector, with reference to Fig. 1, Fig. 2: tested container is the cavity 1 of soft x-ray detector, all be filled with isobutane gas in it and the volumetric standard 2, at volumetric standard and cavity place pressure transducer 3-1,3-2 are set respectively, the output of two sensors meets amplifying circuit 4-1,4-2 respectively, and two amplifying circuits insert a voltage comparator circuit 5 simultaneously, according to the output of comparator circuit, can draw the density value of tested gas.With this numerical value Access Control circuit 6,, can realize automatic control in order to the valve 7 between control detector cavity 1 and the source of the gas 8.
Claims (4)
1, the method for the accurate Detection ﹠ Controling of a kind of gas density, its job step is:
(1), a volumetric standard is set, under standard temperature to the sealing volumetric standard fill with quantitative gas, volumetric standard and tested container are on the same isotherm,
(2), measure the pressure of volumetric standard with pressure transducer, as the reference point of manoscopy,
(3), measure the pressure of tested container, with pressure transducer
(4), the force value of two containers is compared, obtain the density values of gas.
2, according to the method for the accurate Detection ﹠ Controling of the described gas density of claim 1, it is characterized in that, adopt following steps again: with the gas density value is that parameter is controlled the valve between tested container and the source of the gas, realizes control automatically.
3, the device of the accurate Detection ﹠ Controling of a kind of gas density, the place is provided with pressure transducer at tested container, the output of sensor connects amplifying circuit, it is characterized in that: be provided with a volumetric standard, at the volumetric standard place same pressure transducer is set, its output connects amplifying circuit, and two amplifying circuits insert a comparator circuit simultaneously.
4, according to the device of the accurate Detection ﹠ Controling of the described gas density of claim 3, it is characterized in that: with the output Access Control circuit of comparer, the output of control circuit connects the driving mechanism of valve between tested container and the source of the gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107248A CN1090758C (en) | 1997-12-30 | 1997-12-30 | Method for precision detecting and controlling gas density and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107248A CN1090758C (en) | 1997-12-30 | 1997-12-30 | Method for precision detecting and controlling gas density and apparatus thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1187621A CN1187621A (en) | 1998-07-15 |
| CN1090758C true CN1090758C (en) | 2002-09-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97107248A Expired - Fee Related CN1090758C (en) | 1997-12-30 | 1997-12-30 | Method for precision detecting and controlling gas density and apparatus thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1090758C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2925958B1 (en) * | 2007-12-27 | 2010-01-29 | Commissariat Energie Atomique | pycnometre |
| CN102681003A (en) * | 2012-03-09 | 2012-09-19 | 深圳市华唯计量技术开发有限公司 | Electronically controlled fluid gas density stabilizing device for spectrograph |
| EP2770315B1 (en) * | 2013-02-21 | 2021-03-31 | The Swatch Group Research and Development Ltd. | Electronic device provided with an automatic leak detection means |
| CN106226479A (en) * | 2016-08-18 | 2016-12-14 | 珠海格力电器股份有限公司 | The detection method of a kind of refrigerant quality, device and refrigeration system |
-
1997
- 1997-12-30 CN CN97107248A patent/CN1090758C/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 《现代计量学概论》第1版 1987.10.1 鲁绍曾，中国计量出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1187621A (en) | 1998-07-15 |
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